Pixel structure, pixel array, and display panel

ABSTRACT

A pixel structure is provided. The pixel structure includes an active device, a first pixel electrode, a second pixel electrode, and a conductive line. The first pixel electrode is electrically connected to the active device. The second pixel electrode and the first pixel electrode are electrically insulated. The conductive line is located below the first pixel electrode and the second pixel electrode. The active device is electrically connected to the first pixel electrode through the conductive line. The conductive line is coupled to the second pixel electrode to form a coupling capacitance.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of Taiwan applicationserial no. 103116875, filed on May 13, 2014. The entirety of theabove-mentioned patent application is hereby incorporated by referenceherein and made a part of this specification.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a pixel structure, a pixel array and a displaypanel. More particularly, the invention relates to a pixel structure, apixel array and a display panel that reduce a color shift phenomenon.

2. Description of Related Art

Owing to their superior characteristics such as high space utilizationefficiency, low power consumption, no radiation and low electromagneticinterference, etc., liquid crystal display panels have become themainstream in the market. As the sizes of liquid crystal displays becomelarger, in order to overcome viewing angle problems in large-sizeddisplays, wide viewing angle techniques for liquid crystal displaypanels have also been developed. These techniques include: multi-domainvertical alignment (MVA), multi-domain horizontal alignment (MHA),twisted nematic plus wide viewing film and in-plane switching (IPS),etc.

Although the liquid crystal display panels that employs theabove-mentioned techniques are able to achieve the purpose of a wideviewing angle, a color shift phenomenon thereof is still a problemdifficult to handle. For example, when these techniques are employed,the following situations are still met: compared to a front-view image,a side-view image goes bluish at a low gray level, goes reddish orgreenish at a mid gray level, and goes greenish or yellowish at a highgray level. Namely, a problem of color shift in a side view occurs, andthis causes the side-view image of the display panel to look unnatural.Therefore, there is an urgent demand for a liquid crystal display panelthat mitigates both a problem of whitishness in the side view and aproblem of yellowishness or greenishness in the side view when pixelsare at a high gray level.

SUMMARY OF THE INVENTION

The invention provides a pixel structure that mitigates a problem ofyellowishness or greenishness in a side view when pixels are at a highgray level. The invention also provides a pixel array constituted by theabove-mentioned pixel structure.

The invention further provides a display panel, wherein when the pixelsare at a high gray level, the problem of yellowishness or greenishnessin a side-view image is mitigated.

The invention proposes a pixel structure including an active device, afirst pixel electrode, a second pixel electrode and a conductive line.The first pixel electrode is electrically connected to the activedevice. The second pixel electrode is electrically insulated from thefirst pixel electrode. The conductive line is located below the firstpixel electrode and the second pixel electrode, wherein the activedevice is electrically connected to the first pixel electrode throughthe conductive line, and the conductive line is coupled to the secondpixel electrode to form a coupling capacitance.

The invention proposes a pixel structure including an active device, amain pixel electrode and at least one sub-pixel electrode. The mainpixel electrode is electrically connected to the active device, whereinthe main pixel electrode includes a plurality of first branch patterns,wherein a slit width between adjacent first branch patterns is ST1. Theat least one sub-pixel electrode is electrically connected to the activedevice, wherein the at least one sub-pixel electrode includes aplurality of second branch patterns, wherein a slit width betweenadjacent second branch patterns is ST2, wherein ST1<ST2.

The invention proposes a pixel structure including a plurality of firstpixel structures and a plurality of second pixel structures. Each firstpixel structure includes a first active device and a first pixelelectrode. The first pixel electrode is electrically connected to thefirst active device. Each second pixel structure includes a secondactive device, a second pixel electrode, a third pixel electrode and aconductive line. The second pixel electrode is electrically connected tothe second active device. The third pixel electrode is electricallyinsulated from the second pixel electrode. The conductive line islocated below the second pixel electrode and the third pixel electrode,wherein the second active device is electrically connected to the secondpixel electrode through the conductive line, and the conductive line iscoupled to the third pixel electrode to form a coupling capacitance.

The invention further proposes a display panel including a firstsubstrate, a second substrate, a color filter layer and a displaymedium. The first substrate includes the above-mentioned pixel arraydisposed thereon. The second substrate is located opposite to the firstsubstrate. The color filter layer is located on the first substrate orthe second substrate. The display medium is located between the firstsubstrate and the second substrate.

Based on the above, in the pixel structure of the invention, the pixelelectrode is divided into two electrodes, and these two pixel electrodesare electrically insulated from each other. The active device iselectrically connected to one of the pixel electrodes, and theconductive line is coupled to another pixel electrode to form a couplingcapacitance. In this way, the two pixel electrodes in the same pixelstructure have different voltages during a driving process, such thatthe color shift in the side view of the display panel is reduced.

To make the above features and advantages of the invention morecomprehensible, embodiments accompanied with drawings are described indetail as follows.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view of a display panel according to anembodiment of the invention.

FIG. 2 is a schematic top view of a pixel array of the display panel inFIG. 1 according to an embodiment of the invention.

FIG. 3 illustrates a relationship between gray level and color shift ina side view in the display panel in FIG. 1.

FIG. 4 is a schematic top view of a pixel array of the display panel inFIG. 1 according to another embodiment of the invention.

FIG. 5 illustrates a relationship between gray level and color shift ina side view in the display panel according to the embodiment of FIG. 4.

FIG. 6 is a schematic top view of a pixel array of the display panel inFIG. 1 according to still another embodiment of the invention.

FIG. 7 is a schematic top view of a pixel array of the display panel inFIG. 1 according to yet still another embodiment of the invention.

FIG. 8 is a schematic top view of a pixel array of the display panel inFIG. 1 according to another embodiment of the invention.

FIG. 9 illustrates a relationship between gray level and color shift ina side view in the display panel according to the embodiment of FIG. 8.

FIG. 10 is a schematic top view of a pixel array of the display panel inFIG. 1 according to still another embodiment of the invention.

DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS

FIG. 1 is a cross-sectional view of a display panel according to anembodiment of the invention. Referring to FIG. 1, a display panel 100includes a first substrate 10, a second substrate 20, a display medium30 and a color filter layer 40. The display panel 100 is, e.g., a liquidcrystal display panel or a display panel of other types.

A material of the first substrate 10 includes glass, quartz, organicpolymers, or opaque/reflective materials (e.g. metals), etc. The firstsubstrate 10 includes a pixel array 110 disposed thereon. The pixelarray 110 includes a plurality of pixel structures 111, 112 and 113.

The second substrate 20 is located opposite to the first substrate 10. Amaterial of the second substrate 20 includes glass, quartz or organicpolymers, etc. The display medium 30 is located between the firstsubstrate 10 and the second substrate 20. If the display panel 100 is aliquid crystal display panel, the display medium 30 is, e.g., liquidcrystal molecules.

The color filter layer 40 is located on the second substrate 20.However, the invention is not limited thereto. In other embodiments, thecolor filter layer 40 may be located on the first substrate 10. As shownin FIG. 1, the color filter layer 40 includes a plurality of red filterpatterns R, a plurality of blue filter patterns B, and a plurality ofgreen filter patterns G. In the present embodiment, the red filterpatterns R and the green filter patterns G are disposed corresponding tothe pixel structures 111 and 112 of the pixel array 110 on the firstsubstrate 10. Moreover, the blue filter patterns B are disposedcorresponding to the pixel structure 113 of the pixel array 110 on thefirst substrate 10. However, the invention is not limited thereto. Inaddition, the second substrate 20 further includes a black matrix BMdisposed thereon. The black matrix BM has a plurality of openings. Thered filter patterns R, the blue filter patterns B and the green filterpatterns G are respectively disposed in these openings.

In the present embodiment, the display panel 100 further includes anelectrode layer 50. The electrode layer 50 is a transparent conductivelayer, and a material thereof includes metal oxides such as indium tinoxide or indium zinc oxide, etc. The electrode layer 50 is disposedbetween the color filter layer 40 and the display medium 30, and theelectrode layer 50 completely covers the color filter layer 40. However,the invention is not limited thereto. The electrode layer 50 generatesan electric field between itself and the pixel array 110 to control ordrive the display medium 30.

FIG. 2 is a schematic top view of a pixel array of the display panel inFIG. 1. The pixel array 110 in FIG. 2 includes a plurality of pixelstructures 111, 112 and 113. For clarity, FIG. 2 only illustrates onepixel structure 111, one pixel structure 112 and one pixel structure113. However, it should be apparent to persons of ordinary skill in theart that the pixel array 110 may include even more pixel structures. Inthe present embodiment, in view of transmittance and brightness of thedisplay panel, the pixel structures 111, 112 and 113 respectivelycorrespond to a red sub-pixel region, a green sub-pixel region and ablue sub-pixel region. However, the invention is not limited thereto.

The pixel structure 111 includes a scan line SL, a data line DL1, anactive device T1 and a pixel electrode P1.

An extension direction of the scan line SL is different from anextension direction of the data line DL1. It is preferred that theextension direction of the scan line SL is perpendicular to theextension direction of the data line DL1. In addition, the scan line SLand the data line DL1 are located in different layers, and sandwich aninsulating layer (not illustrated) therebetween. The scan line SL andthe data line DL1 are mainly configured to transmit a driving signal fordriving the pixel structure 111. In view of conductivity, the scan lineSL and the data line DL1 are generally made of metal materials. However,the invention is not limited thereto. According to other embodiments,the scan line SL and the data line DL1 may also be made of otherconductive materials, such as alloys, metal oxides, metal nitrides,metal oxynitrides or stacked layers of metal materials and otherconductive materials.

The active device T1 is correspondingly electrically connected to thescan line SL and the data line DL1. Here, the active device T1 is, e.g.,a thin film transistor (TFT), and includes a gate GT1, a channel layerCH1, a drain D1 and a source S1. The gate GT1 is electrically connectedto the scan line SL. The source S1 is electrically connected to the dataline DL1. In other words, when a control signal is input to the scanline SL, there is an electric connection between the scan line SL andthe gate GT1. When a control signal is input to the data line DL1, thereis an electric connection between the data line DL1 and the source S1.The channel layer CH1 is located above the gate GT1 and below the sourceS1 and the drain D1. The present embodiment provides an example wherethe active device T1 is a bottom-gate thin film transistor. However, theinvention is not limited thereto. In other embodiments, the activedevice T1 may be a top-gate thin film transistor.

As shown in FIG. 2, the pixel electrode P1 is correspondinglyelectrically connected to the active device T1. In detail, the drain D1and a conductive line L1 are connected to each other. In the presentembodiment, the drain D1 and the conductive line L1 are located in thesame layer. However, the invention is not limited thereto. Theconductive line L1 is located below the pixel electrode P1. A contact C1is disposed between the conductive line L1 and the pixel electrode P1.The active device T1 is electrically connected to the pixel electrode P1through the contact C1. The pixel electrode P1 is, e.g., a transparentconductive layer, and includes metal oxides, such as indium tin oxide,indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indiumgermanium zinc oxide or other suitable oxides, or stacked layers of atleast two of the above.

In the present embodiment, the pixel electrode P1 is an electrode havinga block pattern. However, the invention is not limited thereto. In otherembodiments, the pixel electrode P1 may be an electrode having otherspecific patterns, including a plurality of V-shaped branch portions oran electrode having a Union Jack-like pattern or other patterns (notillustrated). For example, in the case where the pixel electrode P1 isan electrode having a Union Jack-like pattern, four alignment domainregions are formed in the pixel structure 111, such that a plurality ofliquid crystal molecules in the display medium 30 are tilted along fouralignment directions (not illustrated).

Similarly, the pixel structure 112 includes the scan line SL, a dataline DL2, an active device T2 and a pixel electrode P2.

An extension direction of the scan line SL is different from anextension direction of the data line DL2. It is preferred that theextension direction of the scan line SL is perpendicular to theextension direction of the data line DL2. In addition, the scan line SLand the data line DL2 are located in different layers, and sandwich aninsulating layer (not illustrated) therebetween. The scan line SL andthe data line DL2 are mainly configured to transmit a driving signal fordriving the pixel structure 112. In view of conductivity, the scan lineSL and the data line DL2 are generally made of metal materials. However,the invention is not limited thereto. According to other embodiments,the scan line SL and the data line DL2 may also be made of otherconductive materials, such as alloys, metal oxides, metal nitrides,metal oxynitrides or stacked layers of metal materials and otherconductive materials.

The active device T2 is correspondingly electrically connected to thescan line SL and the data line DL2. Here, the active device T2 is, e.g.,a thin film transistor (TFT), and includes a gate GT2, a channel layerCH2, a drain D2 and a source S2. The gate GT2 is electrically connectedto the scan line SL. The source S2 is electrically connected to the dataline DL2. In other words, when a control signal is input to the scanline SL, there is an electric connection between the scan line SL andthe gate GT2. When a control signal is input to the data line DL2, thereis an electric connection between the data line DL2 and the source S2.The channel layer CH2 is located above the gate GT2 and below the sourceS2 and the drain D2. The present embodiment provides an example wherethe active device T2 is a bottom-gate thin film transistor. However, theinvention is not limited thereto. In other embodiments, the activedevice T2 may be a top-gate thin film transistor.

As shown in FIG. 2, the pixel electrode P2 is correspondinglyelectrically connected to the active device T2. In detail, the drain D2and a conductive line L2 are connected to each other. In the presentembodiment, the drain D2 and the conductive line L2 are located in thesame layer. However, the invention is not limited thereto. Theconductive line L2 is located below the pixel electrode P2. A contact C2is disposed between the conductive line L2 and the pixel electrode P2.The active device T2 is electrically connected to the pixel electrode P2through the contact C2. The pixel electrode P2 is, e.g., a transparentconductive layer, and includes metal oxides, such as indium tin oxide,indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indiumgermanium zinc oxide or other suitable oxides, or stacked layers of atleast two of the above.

In the present embodiment, the pixel electrode P2 is an electrode havinga block pattern. However, the invention is not limited thereto. In otherembodiments, the pixel electrode P2 may be an electrode having otherspecific patterns, including a plurality of V-shaped branch portions oran electrode having a Union Jack-like pattern or other patterns (notillustrated). For example, in the case where the pixel electrode P2 isan electrode having a Union Jack-like pattern, four alignment domainregions are formed in the pixel structure 112, such that a plurality ofliquid crystal molecules in the display medium 30 are tilted along fouralignment directions (not illustrated).

The pixel structure 113 includes the scan line SL, a data line DL3, anactive device T3, and pixel electrodes P3 and P4. It is worth mentioningthat the pixel electrodes P3 and P4 of the pixel structure 113 do notdirectly contact each other.

The extension direction of the scan line SL is different from anextension direction of the data line DL3. It is preferred that theextension direction of the scan line SL is perpendicular to theextension direction of the data line DL3. In addition, the scan line SLand the data line DL3 are located in different layers, and sandwich aninsulating layer (not illustrated) therebetween. The scan line SL andthe data line DL3 are mainly configured to transmit a driving signal fordriving the pixel structure 113. In view of conductivity, the scan lineSL and the data line DL3 are generally made of metal materials. However,the invention is not limited thereto. According to other embodiments,the scan line SL and the data line DL3 may also be made of otherconductive materials, such as alloys, metal oxides, metal nitrides,metal oxynitrides or stacked layers of metal materials and otherconductive materials.

The active device T3 is correspondingly electrically connected to thescan line SL and the data line DL3. Here, the active device T3 is, e.g.,a thin film transistor (TFT), and includes a gate GT3, a channel layerCH3, a drain D3 and a source S3. The gate GT3 is electrically connectedto the scan line SL. The source S3 is electrically connected to the dataline DL3. In other words, when a control signal is input to the scanline SL, there is an electric connection between the scan line SL andthe gate GT3. When a control signal is input to the data line DL3, thereis an electric connection between the data line DL3 and the source S3.The channel layer CH3 is located above the gate GT3 and below the sourceS3 and the drain D3. The present embodiment provides an example wherethe active device T3 is a bottom-gate thin film transistor. However, theinvention is not limited thereto. In other embodiments, the activedevice T3 may be a top-gate thin film transistor.

As shown in FIG. 2, the pixel electrode P3 is correspondinglyelectrically connected to the active device T3. In detail, the drain D3and a conductive line L3 are connected to each other. In the presentembodiment, the drain D3 and the conductive line L3 are located in thesame layer. However, the invention is not limited thereto. Theconductive line L3 is located below the pixel electrode P3. A contact C3is disposed between the conductive line L3 and the pixel electrode P3.The active device T3 is electrically connected to the pixel electrode P3through the contact C3. The pixel electrode P3 is, e.g., a transparentconductive layer, and includes metal oxides, such as indium tin oxide,indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indiumgermanium zinc oxide or other suitable oxides, or stacked layers of atleast two of the above.

In the present embodiment, the pixel electrodes P3 and P4 are electrodeshaving a block pattern. However, the invention is not limited thereto.In other embodiments, the pixel electrodes P3 and P4 may be electrodeshaving other specific patterns, including a plurality of V-shaped branchportions or electrodes having a Union Jack-like pattern or otherpatterns (not illustrated). For example, in the case where the pixelelectrodes P3 and P4 are electrodes having a Union Jack-like pattern,eight alignment domain regions are formed in the pixel structure 113,such that a plurality of liquid crystal molecules in the display medium30 are tilted along eight alignment directions (not illustrated).

Particularly, the pixel electrode P3 is electrically connected to theactive device T3, and the pixel electrode P4 is electrically insulatedfrom the pixel electrode P3. In detail, the drain D3 of the activedevice T3 and the conductive line L3 are connected to each other. In thepresent embodiment, the drain D3 and the conductive line L3 are locatedin the same layer. However, the invention is not limited thereto. Theconductive line L3 is located below the pixel electrodes P3 and P4, andthe contact C3 is disposed between the conductive line L3 and the pixelelectrode P3. The active device T3 is electrically connected to thepixel electrode P3 through the contact C3. In addition, the conductiveline L3 is coupled to the pixel electrode P4 to form a couplingcapacitance. The pixel electrodes P3 and P4 respectively have voltagesV_(P3) and V_(P4).

It is worth mentioning that, in the present embodiment, by dividing apixel electrode of the pixel structure 113 that corresponds to the bluesub-pixel region into the pixel electrode P3 having a larger area andthe pixel electrode P4 having a smaller area, and through theabove-mentioned coupled driving design, the blue sub-pixel region isprovided with the two different pixel voltages V_(P3) and V_(P4),thereby producing different brightnesses. In this way, the color shiftin a side view of pixels at a high gray level is reduced. In addition,the blue sub-pixel region itself is oversaturated. Even if the pixelelectrode P4 having the lower voltage V_(P4) is separately formed, theresulting reduction in brightness is little because the blue colorcontributes very little to the brightness. Therefore, the design of thepixel structure 113 has a minor impact on transmittance of the displaypanel 100. Based on calculation results, a ratio of an area of the pixelelectrode P3 to an area of the pixel electrode P4 is preferably 4:1, anda voltage ratio V_(P3)/V_(P4) of the pixel electrode P3 to the pixelelectrode P4 is preferably 2.85:2.3.

FIG. 3 illustrates a relationship between gray level and color shift ina side view in the display panel in FIG. 1. Referring to FIG. 3, thehorizontal axis indicates the gray level, and the vertical axisindicates degree of color shift in a side view. The solid linerepresents results of the display panel in FIG. 1, and the dashed linerepresents results of a conventional display panel. Specifically, thesolid line represents the results of the display panel having the pixelarray 110 in FIG. 2. Particularly, the pixel structure 113 correspondingto the blue sub-pixel region has a pixel electrode which is divided intothe pixel electrode P3 having a larger area and the pixel electrode P4having a smaller area. By contrast, the conventional display panelrepresented by the dashed line has a pixel array formed by repeatedlyarranging, e.g., the pixel structure 111 in FIG. 2. As shown in FIG. 3,at a higher gray level, the display panel in FIG. 1 according to anembodiment of the invention has a lower degree of color shift in a sideview as compared to the conventional display panel.

FIG. 4 is a schematic top view of a pixel array of the display panel inFIG. 1 according to another embodiment of the invention. Referring toFIG. 1 and FIG. 4 together, a pixel array 210 in FIG. 4 includes aplurality of pixel structures 111, 112 and 213. For clarity, FIG. 4 onlyillustrates one pixel structure 111, one pixel structure 112 and onepixel structure 213. However, it should be apparent to persons ofordinary skill in the art that the pixel array 210 may include even morepixel structures. In the present embodiment, the pixel structures 111,112 and 213 respectively correspond to, e.g., a red sub-pixel region, agreen sub-pixel region and a blue sub-pixel region, wherein in view oftransmittance and brightness of the display panel 100, the pixelstructure 213 preferably corresponds to the blue sub-pixel region.However, the invention is not limited thereto.

The pixel array 210 in FIG. 4 is similar to the pixel array 110 in FIG.2. Thus, the same or similar elements are indicated by the same orsimilar reference numerals, and descriptions thereof are not repeatedherein. A difference between the pixel array 210 and the pixel array 110lies in the pixel structure 213 of the pixel array 210. The pixelstructure 213 includes the scan line SL, the data line DL3, the activedevice T3, and the pixel electrodes P3 and P4. The pixel structure 213is similar to the pixel structure 113 in FIG. 2. Thus, the same orsimilar elements are indicated by the same or similar referencenumerals, and descriptions thereof are not repeated herein. It is worthmentioning that the pixel electrode P4 of the present embodiment hassub-electrodes P4-1 and P4-2 that are separate from each other. However,the invention is not limited thereto. The pixel electrode P4 may haveeven more separate sub-electrodes. As shown in FIG. 4, thesub-electrodes P4-1 and P4-2 are located on the same side of the pixelelectrode P3. However, in other embodiments, the sub-electrodes P4-1 andP4-2 may be located on two opposite sides of the pixel electrode P3.

As shown in FIG. 4, the pixel electrode P3 is correspondinglyelectrically connected to the active device T3. In detail, the drain D3and the conductive line L3 are connected to each other. In the presentembodiment, the drain D3 and the conductive line L3 are located in thesame layer. However, the invention is not limited thereto. Theconductive line L3 is located below the pixel electrodes P3 and P4, andthe contact C3 is disposed between the conductive line L3 and the pixelelectrode P3. The active device T3 is electrically connected to thepixel electrode P3 through the contact C3.

Referring to FIG. 1 and FIG. 4 together, in the present embodiment, thepixel electrodes P3 and P4 are electrodes having a block pattern.However, the invention is not limited thereto. In other embodiments, thepixel electrodes P3 and P4 may be electrodes having other specificpatterns, including a plurality of V-shaped branch portions or pixelelectrodes having a Union Jack-like pattern or other patterns (notillustrated). For example, in the case where the pixel electrodes P3 andP4 are pixel electrodes having a Union Jack-like pattern, twelvealignment domain regions are formed in the pixel structure 213, suchthat a plurality of liquid crystal molecules in the display medium 30are tilted along twelve alignment directions (not illustrated).

Particularly, the pixel electrode P3 is electrically connected to theactive device T3, and the sub-electrodes P4-1 and P4-2 of the pixelelectrode P4 are electrically insulated from the pixel electrode P3. Indetail, the drain D3 of the active device T3 and the conductive line L3are connected to each other. In the present embodiment, the drain D3 andthe conductive line L3 are located in the same layer. However, theinvention is not limited thereto. The conductive line L3 is locatedbelow the pixel electrode P3, the sub-electrodes P4-1 and P4-2, and thecontact C3 is formed between the conductive line L3 and the pixelelectrode P3. The active device T3 is electrically connected to thepixel electrode P3 through the contact C3. In addition, the conductiveline L3 is coupled to the sub-electrode P4-1 of the pixel electrode P4to form a first sub-additional capacitance, and the conductive line L3is coupled to the sub-electrode P4-2 of the pixel electrode P4 to form asecond sub-additional capacitance. The pixel electrode P3, thesub-electrode P4-1 of the pixel electrode P4 and the sub-electrode P4-2of the pixel electrode P4 respectively have voltages V_(P3′), V_(P4-1)and V_(P4-2).

It is worth mentioning that, in the present embodiment, by dividing apixel electrode of the pixel structure 213 that corresponds to the bluesub-pixel region into the pixel electrode P3 having a larger area andthe sub-electrodes P4-1 and P4-2 having a smaller area, and through theabove-mentioned coupled driving design, the blue sub-pixel region isprovided with the three different pixel voltages V_(P3′), V_(P4-1) andV_(P4-2), thereby producing different brightnesses. In this way, thecolor shift in a side view of pixels at a high gray level is reduced. Inaddition, the blue sub-pixel region itself is oversaturated. Even if thesub-electrodes P4-1 and P4-2 having the lower voltages V_(P4-1) andV_(P4-2) are separately formed, the resulting reduction in brightness islittle. Moreover, the blue color contributes very little to thebrightness. Therefore, the design of the pixel structure 213 has a minorimpact on transmittance of the display panel. Based on calculationresults, a ratio of an area of the pixel electrode P3 to an area of thesub-electrode P4-1 to an area of the sub-electrode P4-2 is preferably3:1:1, and a voltage ratio V_(P3′)/N_(P4-1)/V_(P4-2) of the pixelelectrode P3 to the sub-electrode P4-1 to the sub-electrode P4-2 ispreferably 2.85:2.5:2.1.

FIG. 5 illustrates a relationship between gray level and color shift ina side view in the display panel according to the embodiment of FIG. 4.The horizontal axis indicates the gray level, and the vertical axisindicates degree of color shift in a side view. The solid linerepresents results of the display panel in FIG. 1 with the pixel arrayof FIG. 4, and the dashed line represents results of a conventionaldisplay panel. Specifically, the solid line represents the results ofthe display panel having the pixel array 210 in FIG. 4. Particularly,the pixel array 210 includes the pixel structure 213 that corresponds tothe blue sub-pixel region, and a pixel electrode of the pixel structure213 is divided into the pixel electrode P3 having a larger area and thetwo sub-electrodes P4-1 and P4-2 having a smaller area. By contrast, theconventional display panel represented by the dashed line has a pixelarray formed by repeatedly arranging, e.g., the pixel structure 111 inFIG. 4. As shown in FIG. 5, at a higher gray level, the display panelaccording to the embodiment of FIG. 4 has a lower degree of color shiftin a side view as compared to the conventional display panel.

FIG. 6 is a schematic top view of a pixel array of the display panel inFIG. 1 according to still another embodiment of the invention. Referringto FIG. 1 and FIG. 6 together, a pixel array 310 in FIG. 6 includes aplurality of pixel structures 111, 112 and 313. For clarity, FIG. 6 onlyillustrates one pixel structure 111, one pixel structure 112 and onepixel structure 313. However, it should be apparent to persons ofordinary skill in the art that the pixel array 310 may include even morepixel structures. In the present embodiment, the pixel structures 111,112 and 313 respectively correspond to, e.g., a red sub-pixel region, agreen sub-pixel region and a blue sub-pixel region, wherein in view oftransmittance and brightness of the display panel 100, the pixelstructure 313 preferably corresponds to the blue sub-pixel region.However, the invention is not limited thereto.

The pixel array 310 in FIG. 6 is similar to the pixel array 110 in FIG.2. Thus, the same or similar elements are indicated by the same orsimilar reference numerals, and descriptions thereof are not repeatedherein. A difference between the pixel array 310 and the pixel array 110lies in the pixel structure 313 of the pixel array 310. The pixelstructure 313 includes the scan line SL, the data line DL3, the activedevice T3, and pixel electrodes P5 and P6. The pixel structure 313 issimilar to the pixel structure 113 in FIG. 2. Thus, the same or similarelements are indicated by the same or similar reference numerals, anddescriptions thereof are not repeated herein. It is worth mentioningthat the pixel electrode P6 of the present embodiment has sub-electrodesP6-1 and P6-2 that are separate from each other. However, the inventionis not limited thereto. The pixel electrode P6 may have even moreseparate sub-electrodes.

Particularly, the pixel electrode P5 is electrically connected to theactive device T3, and the sub-electrodes P6-1 and P6-2 of the pixelelectrode P6 are electrically insulated from the pixel electrode P5. Indetail, the drain D3 of the active device T3 and the conductive line L3are connected to each other. In the present embodiment, the drain D3 andthe conductive line L3 are located in the same layer. However, theinvention is not limited thereto. The conductive line L3 is locatedbelow the pixel electrode P5, the sub-electrode P6-1 and thesub-electrode P6-2, and the contact C3 is formed between the conductiveline L3 and the pixel electrode P5. The active device T3 is electricallyconnected to the pixel electrode P5 through the contact C3. In addition,the conductive line L3 is coupled to the sub-electrode P6-1 of the pixelelectrode P6 to form the first sub-additional capacitance, and theconductive line L3 is coupled to the sub-electrode P6-2 of the pixelelectrode P6 to form the second sub-additional capacitance.

Referring to FIG. 4 and FIG. 6 together, a difference between theembodiments of FIG. 4 and FIG. 6 is as follows. In FIG. 4, the twosub-electrodes P4-1 and P4-2 are located on the same side of the pixelelectrode P3, while in FIG. 6, the two sub-electrodes P6-1 and P6-2 arelocated on two opposite sides of the pixel electrode P5. In addition, asshown in FIG. 6, the two sub-electrodes P6-1 and P6-2 are electrodeshaving a triangular pattern, and the pixel electrode P5 is an electrodehaving a polygonal pattern. This increases the first sub-additionalcapacitance and the second sub-additional capacitance formed by couplingthe conductive line L3 to the sub-electrodes P6-1 and P6-2 respectively,so as to reduce the color shift in a side view of the display panel.However, in other embodiments, the sub-electrodes P6-1 and P6-2 and thepixel electrode P5 may be electrodes having other patterns.

FIG. 7 is a schematic top view of a pixel array of the display panel inFIG. 1 according to yet still another embodiment of the invention.Referring to FIG. 1 and FIG. 7 together, a pixel array 410 in FIG. 7includes a plurality of pixel structures 111, 112 and 413. For clarity,FIG. 7 only illustrates one pixel structure 111, one pixel structure 112and one pixel structure 413. However, it should be apparent to personsof ordinary skill in the art that the pixel array 410 may include evenmore pixel structures. In the present embodiment, the pixel structures111, 112 and 413 respectively correspond to, e.g., a red sub-pixelregion, a green sub-pixel region and a blue sub-pixel region, wherein inview of transmittance and brightness of the display panel 100, the pixelstructure 413 preferably corresponds to the blue sub-pixel region.However, the invention is not limited thereto.

The pixel array 410 in FIG. 7 is similar to the pixel array 110 in FIG.2. Thus, the same or similar elements are indicated by the same orsimilar reference numerals, and descriptions thereof are not repeatedherein. A difference between the pixel array 410 and the pixel array 110lies in the pixel structure 413 of the pixel array 410. The pixelstructure 413 includes the scan line SL, the data line DL3, the activedevice T3, and the pixel electrodes P5 and P6. The pixel structure 413in FIG. 7 is similar to the pixel structure 113 in FIG. 2. Thus, thesame or similar elements are indicated by the same or similar referencenumerals, and descriptions thereof are not repeated herein. It is worthmentioning that the pixel electrode P6 of the present embodiment has thesub-electrodes P6-1 and P6-2 that are separate from each other. However,the invention is not limited thereto. The pixel electrode P6 may haveeven more separate sub-electrodes. As shown in FIG. 7, thesub-electrodes P6-1 and P6-2 are located on two opposite sides of thepixel electrode P5. However, in other embodiments, the sub-electrodesP6-1 and P6-2 may be located on the same side of the pixel electrode P5.

Particularly, the pixel electrode P5 is electrically connected to theactive device T3, and the sub-electrodes P6-1 and P6-2 of the pixelelectrode P6 are electrically insulated from the pixel electrode P5. Indetail, the drain D3 of the active device T3 and the conductive line L3are connected to each other. In the present embodiment, the drain D3 andthe conductive line L3 are located in the same layer. However, theinvention is not limited thereto. The conductive line L3 is locatedbelow the pixel electrode P5, the sub-electrode P6-1 and thesub-electrode P6-2, and the contact C3 is formed between the conductiveline L3 and the pixel electrode P5. The active device T3 is electricallyconnected to the pixel electrode P5 through the contact C3. In addition,the conductive line L3 is coupled to the sub-electrode P6-1 of the pixelelectrode P6 to form the first sub-additional capacitance, and theconductive line L3 is coupled to the sub-electrode P6-2 of the pixelelectrode P6 to form the second sub-additional capacitance.

Referring to FIG. 4 and FIG. 7 together, a difference between theembodiments of FIG. 4 and FIG. 7 is as follows. In FIG. 4, the twosub-electrodes P4-1 and P4-2 are located on the same side of the pixelelectrode P3, while in FIG. 7, the two sub-electrodes P6-1 and P6-2 arelocated on two opposite sides of the pixel electrode P5. Particularly,as shown in FIG. 7, the conductive line L3 includes a main portion L3 aand branch portions L3 b. The main portion L3 a is disposed overlappingthe pixel electrode P5. The branch portions L3 b extend from the mainportion L3 a. In the present embodiment, the conductive line L3 has twobranch portions L3 b respectively disposed overlapping thesub-electrodes P6-1 and P6-2 of the pixel electrode P6. However, theinvention is not limited thereto. As shown in FIG. 7, the conductiveline L3 is formed in a double-cross shape. By disposing the double-crossshaped conductive line L3 in a manner overlapping the pixel electrode P5and the sub-electrodes P6-1 and P6-2, the first sub-additionalcapacitance and the second sub-additional capacitance formed by couplingthe conductive line L3 to the sub-electrodes P6-1 and P6-2 respectivelyare considerably increased, so as to reduce the color shift in a sideview of the display panel.

FIG. 8 is a schematic top view of a pixel array of the display panel inFIG. 1 according to another embodiment of the invention. A pixel array510 in FIG. 8 includes a plurality of pixel structures 511, 512 and 513.For clarity, FIG. 8 only illustrates one pixel structure 511, one pixelstructure 512 and one pixel structure 513. However, it should beapparent to persons of ordinary skill in the art that the pixel array510 may include even more pixel structures. In the present embodiment,the pixel structures 511, 512 and 513 respectively correspond to, e.g.,a red sub-pixel region, a green sub-pixel region and a blue sub-pixelregion, wherein in view of transmittance and brightness of the displaypanel 100, the pixel structure 513 preferably corresponds to the bluesub-pixel region. However, the invention is not limited thereto.

The pixel structure 511 includes a scan line SL1, data lines DL4 andDL5, active devices T4 and T5, and pixel electrodes PM1 and PS1.

An extension direction of the scan line SL1 is different from extensiondirections of the data lines DL4 and DL5. It is preferred that theextension direction of the scan line SL1 is perpendicular to theextension directions of the data lines DL4 and DL5. In addition, thescan line SL1 and the data lines DL4 and DL5 are located in differentlayers, and sandwich an insulating layer (not illustrated) therebetween.The scan line SL1 and the data lines DL4 and DL5 are mainly configuredto transmit a driving signal for driving the pixel structure 511. Inview of conductivity, the scan line SL1 and the data lines DL4 and DL5are generally made of metal materials. However, the invention is notlimited thereto. According to other embodiments, the scan line SL1 andthe data lines DL4 and DL5 may also be made of other conductivematerials, such as alloys, metal oxides, metal nitrides, metaloxynitrides or stacked layers of metal materials and other conductivematerials.

In the pixel structure 511, the active device T4 is electricallyconnected to the scan line SL1 and the data line DL4, and the activedevice T5 is electrically connected to the scan line SL1 and the dataline DL5. Here, the active device T4 is, e.g., a thin film transistor,and includes a gate GT4, a channel layer CH4, a drain D4 and a sourceS4. Similarly, the active device T5 includes, e.g., a gate GT5, achannel layer CH5, a drain D5 and a source S5. The gates GT4 and GT5 areeach electrically connected to the scan line SL1. In the pixel structure511, the source S4 is electrically connected to the data line DL4, andthe source S5 is electrically connected to the data line DL5. Thechannel layer CH4 is located above the gate GT4 and below the source S4and the drain D4, and the channel layer CH5 is located above the gateGT5 and below the source S5 and the drain D5. The present embodimentprovides an example where the active devices T4 and T5 are bottom-gatethin film transistors. However, the invention is not limited thereto. Inother embodiments, the active devices T4 and T5 may be top-gate thinfilm transistors.

As shown in FIG. 8, in the pixel structure 511, the pixel electrode PM1is electrically connected to the active device T5, and the pixelelectrode PS1 is electrically connected to the active device T4. Indetail, a contact C4 is disposed between the drain D4 and the pixelelectrode PS1. A contact C5 is disposed between the drain D5 and thepixel electrode PM1. The active device T4 is electrically connected tothe pixel electrode PS1 through the contact C4, and the active device T5is electrically connected to the pixel electrode PM1 through the contactC5. The pixel electrodes PM1 and PS1 are, e.g., transparent conductivelayers, and include metal oxides, such as indium tin oxide, indium zincoxide, aluminum tin oxide, aluminum zinc oxide, indium germanium zincoxide or other suitable oxides, or stacked layers of at least two of theabove.

Referring to FIG. 1 and FIG. 8 together, in the present embodiment, thepixel electrodes PM1 and PS1 are electrodes having a block pattern.However, the invention is not limited thereto. In other embodiments, thepixel electrodes PM1 and PS1 may be electrodes having other specificpatterns, including a plurality of V-shaped branch portions or pixelelectrodes having a Union Jack-like pattern or other patterns (notillustrated). For example, in the case where the pixel electrodes PM1and PS1 are pixel electrodes having a Union Jack-like pattern, eightalignment domain regions are formed in the pixel structure 511, suchthat a plurality of liquid crystal molecules in the display medium 30are tilted along eight alignment directions (not illustrated).

Similarly, the pixel structure 512 includes the scan line SL1, datalines DL6 and DL7, active devices T6 and T7, and pixel electrodes PM2and PS2.

The extension direction of the scan line SL1 is different from extensiondirections of the data lines DL6 and DL7. It is preferred that theextension direction of the scan line SL1 is perpendicular to theextension directions of the data lines DL6 and DL7. In addition, thescan line SL1 and the data lines DL6 and DL7 are located in differentlayers, and sandwich an insulating layer (not illustrated) therebetween.The scan line SL1 and the data lines DL6 and DL7 are mainly configuredto transmit a driving signal for driving the pixel structure 512. Inview of conductivity, the scan line SL1 and the data lines DL6 and DL7are generally made of metal materials. However, the invention is notlimited thereto. According to other embodiments, the scan line SL1 andthe data lines DL6 and DL7 may also be made of other conductivematerials, such as alloys, metal oxides, metal nitrides, metaloxynitrides or stacked layers of metal materials and other conductivematerials.

In the pixel structure 512, the active device T6 is electricallyconnected to the scan line SL1 and the data line DL6, and the activedevice T7 is electrically connected to the scan line SL1 and the dataline DL7. Here, the active device T6 is, e.g., a thin film transistor,and includes a gate GT6, a channel layer CH6, a drain D6 and a sourceS6. Similarly, the active device T7 includes, e.g., a gate GT7, achannel layer CH7, a drain D7 and a source S7. The gates GT6 and GT7 areeach electrically connected to the scan line SL1. In the pixel structure512, the source S6 is electrically connected to the data line DL6, andthe source S7 is electrically connected to the data line DL7. Thechannel layer CH6 is located above the gate GT6 and below the source S6and the drain D6, and the channel layer CH7 is located above the gateGT7 and below the source S7 and the drain D7. The present embodimentprovides an example where the active devices T6 and T7 are bottom-gatethin film transistors. However, the invention is not limited thereto. Inother embodiments, the active devices T6 and T7 may be top-gate thinfilm transistors.

As shown in FIG. 8, in the pixel structure 512, the pixel electrode PM2is electrically connected to the active device T7, and the pixelelectrode PS2 is electrically connected to the active device T6. Indetail, a contact C6 is disposed between the drain D6 and the pixelelectrode PS2. A contact C7 is disposed between the drain D7 and thepixel electrode PM2. The active device T6 is electrically connected tothe pixel electrode PS2 through the contact C6, and the active device T7is electrically connected to the pixel electrode PM2 through the contactC7. The pixel electrodes PM2 and PS2 are, e.g., transparent conductivelayers, and include metal oxides, such as indium tin oxide, indium zincoxide, aluminum tin oxide, aluminum zinc oxide, indium germanium zincoxide or other suitable oxides, or stacked layers of at least two of theabove.

Referring to FIG. 1 and FIG. 8 together, in the present embodiment, thepixel electrodes PM2 and PS2 are electrodes having a block pattern.However, the invention is not limited thereto. In other embodiments, thepixel electrodes PM2 and PS2 may be electrodes having other specificpatterns, including a plurality of V-shaped branch portions or pixelelectrodes having a Union Jack-like pattern or other patterns (notillustrated). For example, in the case where the pixel electrodes PM2and PS2 are pixel electrodes having a Union Jack-like pattern, eightalignment domain regions are formed in the pixel structure 512, suchthat a plurality of liquid crystal molecules in the display medium 30are tilted along eight alignment directions (not illustrated).

It is worth mentioning that in the present embodiment, the pixelstructures 511 and 512 respectively have the pixel electrodes PM1 andPM2 (also referred to as main pixel electrodes) having a smaller area,and the pixel electrodes PS1 and PS2 (also referred to as sub-pixelelectrodes) having a larger area. In the pixel structure 511, the pixelelectrodes PM1 and PS1 respectively have voltages V_(PM1) and V_(PS1).Based on calculation results, a ratio of an area of the pixel electrodePM1 to an area of the pixel electrode PS1 is preferably 1:2, and avoltage ratio V_(PM1)/V_(PS1) of the pixel electrode PM1 to the pixelelectrode PS1 is preferably 2.85:2.1. Similarly, in the pixel structure512, the pixel electrodes PM2 and PS2 respectively have voltages V_(PM2)and V_(PS2). Based on calculation results, a ratio of an area of thepixel electrode PM2 to an area of the pixel electrode PS2 is preferably1:2, and a voltage ratio V_(PM2)/V_(PS2) of the pixel electrode PM2 tothe pixel electrode PS2 is preferably 2.85:2.1.

The pixel structure 513 includes the scan line SL1, data lines DL8 andDL9, active devices T8 and T9, and pixel electrodes PM3, PS3 and PE,wherein the pixel electrode PE is also referred to as a main pixelelectrode, and the pixel electrode PS3 is also referred to as asub-pixel electrode. The same or similar elements of the pixel structure513 are indicated by the same or similar reference numerals as those ofthe pixel structures 511 and 512, and descriptions thereof are notrepeated herein. It is worth mentioning that the pixel electrodes PM3,PS3 and PE of the pixel structure 513 do not directly contact oneanother.

In the present embodiment, the pixel electrodes PM3, PS3 and PE areelectrodes having a block pattern. However, the invention is not limitedthereto. In other embodiments, the pixel electrodes PM3, PS3 and PE maybe electrodes having other specific patterns, including a plurality ofV-shaped branch portions or pixel electrodes having a Union Jack-likepattern or other patterns (not illustrated). For example, in the casewhere the pixel electrodes PM3, PS3 and PE are pixel electrodes having aUnion Jack-like pattern, twelve alignment domain regions are formed inthe pixel structure 513, such that a plurality of liquid crystalmolecules in the display medium 30 are tilted along twelve alignmentdirections (not illustrated).

Particularly, the pixel electrode PS3 is electrically connected to theactive device T8, and the pixel electrode PM3 is electrically connectedto the active device T9. The pixel electrodes PM3, PS3 and PE areelectrically insulated from one another. In detail, a drain D8 of theactive device T8 and a conductive line L8 are connected to each other,and a contact C8 is disposed between the conductive line L8 and thepixel electrode PS3. The active device T8 is electrically connected tothe pixel electrode PS3 through the contact C8. In addition, theconductive line L8 is coupled to the pixel electrode PE to form acoupling capacitance. A contact C9 is disposed between a drain D9 of theactive device T9 and the pixel electrode PM3. The active device T9 iselectrically connected to the pixel electrode PM3 through the contactC9. The pixel electrodes PM3, PS3 and PE respectively have voltagesV_(PM3), V_(PS3) and V_(PE).

It is worth mentioning that, in the present embodiment, by dividing apixel electrode of the pixel structure 513 that corresponds to the bluesub-pixel region into the pixel electrodes PM3, PS3 and PE, and throughthe above-mentioned coupled driving design, the blue sub-pixel region isprovided with the three different pixel voltages V_(PM3), V_(PS3) andV_(PE), thereby producing different brightnesses. In this way, the colorshift in a side view of pixels at a high gray level is reduced. Inaddition, the blue sub-pixel region itself is oversaturated. Even if thepixel electrode PS3 having the lower voltage V_(PS3) and the sub-pixelelectrode PE having the lower voltage V_(PE) are separately formed, theresulting reduction in brightness is little. Moreover, the blue colorcontributes very little to the brightness. Therefore, the design of thepixel structure 513 has a minor impact on transmittance of the displaypanel. Based on calculation results, a ratio of an area of the pixelelectrode PM3 to a sum of areas of the pixel electrodes PS3 and PE ispreferably 1:2, and a ratio of the area of the pixel electrode PS3 tothe area of the pixel electrode PE is preferably 4:1. In addition, avoltage ratio V_(PM3)/V_(PS3) of the pixel electrode PM3 to the pixelelectrode PS3 is preferably 2.85:2.2, and a voltage ratio V_(PS3)/V_(PE)of the pixel electrode PS3 to the pixel electrode PE is preferably2.85:2.3.

FIG. 9 illustrates a relationship between gray level and color shift ina side view in the display panel according to the embodiment of FIG. 8.The horizontal axis indicates the gray level, and the vertical axisindicates degree of color shift in a side view. The solid linerepresents results of the display panel in FIG. 8, and the dashed linerepresents results of a conventional display panel. Specifically, thesolid line represents the results of the display panel having the pixelarray 510 in FIG. 8. Particularly, the pixel array 510 includes thepixel structure 513 that corresponds to the blue sub-pixel region, and apixel electrode of the pixel structure 513 is divided into the pixelelectrodes PM3, PS3 and PE. By contrast, the conventional display panelrepresented by the dashed line has a pixel array formed by repeatedlyarranging, e.g., the pixel structure 111 in FIG. 4. As shown in FIG. 9,at a higher gray level, the display panel according to the embodiment ofFIG. 8 has a lower degree of color shift in a side view as compared tothe conventional display panel.

In the embodiment of FIG. 8, the pixel structures 511, 512 and 513 inthe pixel array 510 are pixel structures having a main pixel electrodeand a sub-pixel electrode, wherein each of the pixel structures isdriven by two data lines and one scan line. Accordingly, the main pixelelectrode and the sub-pixel electrode are provided with differentvoltages, such that the color shift in a side view of the display panelis reduced. The pixel structures 511, 512 and 513 in the pixel array 510in FIG. 8 are also referred to as 2D1G pixel structures. Actually, inthe case where a pixel structure is designed to include a main pixelelectrode and a sub-pixel electrode that have different voltages, thepixel structure may be a pixel structure of other types. For example, bydisposing a shared switch element and a shared capacitor, the main pixelelectrode and the sub-pixel electrode are provided with differentvoltages. Since the above-mentioned pixel structure that includes ashared switch element and a shared capacitor is a prior-art pixelstructure for solving the color shift problem, descriptions thereof willbe omitted herein.

FIG. 10 is a schematic top view of a pixel array of the display panel inFIG. 1 according to still another embodiment of the invention. Referringto FIG. 1 and FIG. 10 together, a pixel array 610 in FIG. 10 includes aplurality of pixel structures 611 and 613. For clarity, FIG. 10 onlyillustrates one pixel structure 611 and one pixel structure 613.However, it should be apparent to persons of ordinary skill in the artthat the pixel array 610 may include even more pixel structures. In thepresent embodiment, the pixel structures 611 and 613 respectivelycorrespond to, e.g., a red sub-pixel region and a blue sub-pixel region,wherein in view of transmittance and brightness of the display panel100, the pixel structure 613 preferably corresponds to the bluesub-pixel region. However, the invention is not limited thereto.

The pixel structure 611 includes a scan line SL2, data lines DL10 andDL11, active devices T10 and T11, a pixel electrode P7 (also referred toas a main pixel electrode), and a pixel electrode P8, wherein the pixelelectrode P8 includes two sub-pixel electrodes P8-1 and P8-2. It is tobe noted that the sub-pixel electrodes P8-1 and P8-2 of the presentembodiment are located on two opposite sides of the pixel electrode P7.However, the invention is not limited thereto.

An extension direction of the scan line SL2 is different from extensiondirections of the data lines DL10 and DL11. It is preferred that theextension direction of the scan line SL2 is perpendicular to theextension directions of the data lines DL10 and DL11. In addition, thescan line SL2 and the data lines DL10 and DL11 are located in differentlayers, and sandwich an insulating layer (not illustrated) therebetween.The scan line SL2 and the data lines DL10 and DL11 are mainly configuredto transmit a driving signal for driving the pixel structure 611. Inview of conductivity, the scan line SL2 and the data lines DL10 and DL11are generally made of metal materials. However, the invention is notlimited thereto. According to other embodiments, the scan line SL2 andthe data lines DL10 and DL11 may also be made of other conductivematerials, such as alloys, metal oxides, metal nitrides, metaloxynitrides or stacked layers of metal materials and other conductivematerials.

In the pixel structure 611, the active device T10 is electricallyconnected to the scan line SL2 and the data line DL10, and the activedevice T11 is electrically connected to the scan line SL2 and the dataline DL11. Here, the active device T10 is, e.g., a thin film transistor,and includes a gate GT10, a channel layer CH10, a drain D10 and a sourceS10. Similarly, the active device T11 includes, e.g., a gate GT11, achannel layer CH11, a drain D11 and a source S11. The gates GT10 andGT11 are each electrically connected to the scan line SL2. In the pixelstructure 611, the source S10 is electrically connected to the data lineDL10, and the source S11 is electrically connected to the data lineDL11. The channel layer CH10 is located above the gate GT10 and belowthe source S10 and the drain D10, and the channel layer CH11 is locatedabove the gate GT11 and below the source S11 and the drain D11. Thepresent embodiment provides an example where the active devices T10 andT11 are bottom-gate thin film transistors. However, the invention is notlimited thereto. In other embodiments, the active devices T10 and T11may be top-gate thin film transistors.

As shown in FIG. 10, in the pixel structure 611, the pixel electrode P7is electrically connected to the active device T10, and the pixelelectrode P8 is electrically connected to the active device T11. Thepixel electrodes P7 and P8 are, e.g., transparent conductive layers, andinclude metal oxides, such as indium tin oxide, indium zinc oxide,aluminum tin oxide, aluminum zinc oxide, indium germanium zinc oxide orother suitable oxides, or stacked layers of at least two of the above.

As shown in FIG. 10, a contact C10 is disposed between the drain D10 ofthe active device T10 and the pixel electrode P7. The active device T10is electrically connected to the main pixel electrode P7 through thecontact C10. In addition, the sub-pixel electrodes P8-1 and P8-2 arecorrespondingly electrically connected to the active device T11. Indetail, the drain D11 and a conductive line L11 are connected to eachother, and contacts C11 and C12 are respectively disposed between theconductive line L11 and the sub-pixel electrode P8-1 and between theconductive line L11 and the sub-pixel electrode P8-2. The active deviceT11 is electrically connected to the sub-pixel electrodes P8-1 and P8-2respectively through the contacts C11 and C12.

In the present embodiment, as shown in FIG. 10, the pixel electrodes P7and P8 are both electrodes having a Union Jack-like pattern. In detail,the pixel electrodes P7 and P8 include a plurality of branch patterns650. A slit width between adjacent branch patterns 650 is ST. It is tobe noted that the pixel electrodes P7 and P8 have the branch patterns650 having the same width.

Similarly, the pixel structure 613 includes the scan line SL2, datalines DL12 and DL13, active devices T12 and T13, a pixel electrode P9(also referred to as a main pixel electrode), and a pixel electrode P10,wherein the pixel electrode P10 includes two sub-pixel electrodes P10-1and P10-2. However, the invention is not limited thereto. In otherembodiments, the pixel structures 611 and 613 may include even moresub-pixel electrodes. It is to be noted that the sub-pixel electrodesP10-1 and P10-2 of the present embodiment are located on two oppositesides of the pixel electrode P9. However, the invention is not limitedthereto.

The extension direction of the scan line SL2 is different from extensiondirections of the data lines DL12 and DL13. It is preferred that theextension direction of the scan line SL2 is perpendicular to theextension directions of the data lines DL12 and DL13. In addition, thescan line SL2 and the data lines DL12 and DL13 are located in differentlayers, and sandwich an insulating layer (not illustrated) therebetween.The scan line SL2 and the data lines DL12 and DL13 are mainly configuredto transmit a driving signal for driving the pixel structure 613. Inview of conductivity, the scan line SL2 and the data lines DL12 and DL13are generally made of metal materials. However, the invention is notlimited thereto. According to other embodiments, the scan line SL2 andthe data lines DL12 and DL13 may also be made of other conductivematerials, such as alloys, metal oxides, metal nitrides, metaloxynitrides or stacked layers of metal materials and other conductivematerials.

In the pixel structure 613, the active device T12 is electricallyconnected to the scan line SL2 and the data line DL12, and the activedevice T13 is electrically connected to the scan line SL2 and the dataline DL13. Here, the active device T12 is, e.g., a thin film transistor,and includes a gate GT12, a channel layer CH12, a drain D12 and a sourceS12. Similarly, the active device T13 includes, e.g., a gate GT13, achannel layer CH13, a drain D13 and a source S13. The gates GT12 andGT13 are each electrically connected to the scan line SL2. In the pixelstructure 613, the source S12 is electrically connected to the data lineDL12, and the source S13 is electrically connected to the data lineDL13. The channel layer CH12 is located above the gate GT12 and belowthe source S12 and the drain D12, and the channel layer CH13 is locatedabove the gate GT13 and below the source S13 and the drain D13. Thepresent embodiment provides an example where the active devices T12 andT13 are bottom-gate thin film transistors. However, the invention is notlimited thereto. In other embodiments, the active devices T12 and T13may be top-gate thin film transistors.

As shown in FIG. 10, in the pixel structure 613, the pixel electrode P9is electrically connected to the active device T12, and the pixelelectrode P10 is electrically connected to the active device T13. Thepixel electrodes P9 and P10 are, e.g., transparent conductive layers,and include metal oxides, such as indium tin oxide, indium zinc oxide,aluminum tin oxide, aluminum zinc oxide, indium germanium zinc oxide orother suitable oxides, or stacked layers of at least two of the above.

In the present embodiment, as shown in FIG. 10, the pixel electrode P9includes a plurality of first branch patterns 651. A slit width betweenadjacent first branch patterns 651 is ST1. The sub-pixel electrodesP10-1 and P10-2 each includes a plurality of second branch patterns 652.A slit width between adjacent second branch patterns 652 is ST2. It isto be noted that the first branch pattern 651 of the pixel electrode P9and the second branch pattern 652 of the pixel electrode P10 havedifferent widths. Specifically, the slit width ST between the firstbranch patterns 651 is smaller than the slit width ST2 between thesecond branch patterns 652.

As shown in FIG. 10, the pixel electrode P9 is electrically connected tothe active device T12. In detail, a contact C13 is disposed between thedrain D12 of the active device T12 and the pixel electrode P9. Theactive device T12 is electrically connected to the main pixel electrodeP9 through the contact C13. In addition, the sub-pixel electrodes P10-1and P10-2 are correspondingly electrically connected to the activedevice T13. In detail, the drain D13 and a conductive line L13 areconnected to each other, and contacts C14 and C15 are respectivelydisposed between the conductive line L13 and the sub-pixel electrodeP10-1 and between the conductive line L13 and the sub-pixel electrodeP10-2. The active device T13 is electrically connected to the sub-pixelelectrodes P10-1 and P10-2 respectively through the contacts C14 andC15. The pixel electrodes P9 and P10 respectively have voltages V_(P9)and V_(P10).

It is worth mentioning that, in the present embodiment, by dividing apixel electrode of the pixel structure 613 that corresponds to the bluesub-pixel region into the pixel electrode P9 having a larger area andthe sub-pixel electrodes P10-1 and P10-2 having a smaller area, andthrough the above-mentioned coupled driving design, the blue sub-pixelregion is provided with the two different pixel voltages V_(P9) andV_(P10), thereby producing different brightnesses. In this way, thecolor shift in a side view of pixels at a high gray level is reduced. Inaddition, the blue sub-pixel region itself is oversaturated. Even if thesub-pixel electrodes P10-1 and P10-2 having the lower voltage V_(P10)are separately formed, the resulting reduction in brightness is little.Moreover, the blue color contributes very little to the brightness.Therefore, the design of the pixel structure 613 has a minor impact ontransmittance of the display panel. Based on calculation results, aratio of an area of the pixel electrode P9 to an area of the pixelelectrode P10 (i.e. a sum of areas of the sub-pixel electrodes P10-1 andP10-2) is preferably 4:1. In addition, a voltage ratio V_(P9)/V_(P10) ofthe pixel electrode P9 to the pixel electrode P10 is preferably 2.85:2.3

In summary, in the pixel structure of the invention, the pixel electrodeis divided into two electrodes, and these two pixel electrodes areelectrically insulated from each other. The active device iselectrically connected to one of the pixel electrodes, and theconductive line is coupled to another pixel electrode to form a couplingcapacitance. In this way, the two pixel electrodes in the same pixelstructure have different voltages during a driving process, such thatthe color shift in the side view of the display panel is reduced.

Although the invention has been described with reference to the aboveembodiments, it will be apparent to persons of ordinary skill in the artthat modifications to the described embodiments may be made withoutdeparting from the spirit of the invention. Accordingly, the scope ofthe invention will be defined by the attached claims and not by theabove detailed descriptions.

What is claimed is:
 1. A pixel structure, comprising: an active device;a first pixel electrode electrically connected to the active device; asecond pixel electrode electrically insulated from the first pixelelectrode; and a conductive line located below the first pixel electrodeand the second pixel electrode, wherein the active device iselectrically connected to the first pixel electrode through theconductive line, and the conductive line is coupled to the second pixelelectrode to form a coupling capacitance.
 2. The pixel structure asclaimed in claim 1, wherein a ratio of an area of the first pixelelectrode to an area of the second pixel electrode is 4:1.
 3. The pixelstructure as claimed in claim 1, wherein a voltage ratio of the firstpixel electrode to the second pixel electrode is 2.85:2.3.
 4. The pixelstructure as claimed in claim 1, wherein the second pixel electrode hasa plurality of sub-electrodes that are separate from each other, and theconductive line is coupled to the sub-electrodes to form a plurality ofcoupling capacitances.
 5. The pixel structure as claimed in claim 4,wherein the sub-electrodes are located on two sides of the first pixelelectrode.
 6. The pixel structure as claimed in claim 1, wherein thesecond pixel electrode has a first sub-electrode and a secondsub-electrode that are separate from each other, the conductive line iscoupled to the first sub-electrode to form a first sub-additionalcapacitance, and the conductive line is coupled to the secondsub-electrode to form a second sub-additional capacitance, wherein aratio of an area of the first pixel electrode to an area of the firstsub-electrode to an area of the second sub-electrode is 3:1:1.
 7. Thepixel structure as claimed in claim 6, wherein a voltage ratio of thefirst pixel electrode to the first sub-electrode to the secondsub-electrode is 2.85:2.5:2.1.
 8. The pixel structure as claimed inclaim 1, wherein the first pixel electrode comprises a main pixelelectrode and a sub-pixel electrode, a ratio of an area of the mainpixel electrode to a sum of areas of the sub-pixel electrode and thesecond pixel electrode is 1:2, and a ratio of the area of the sub-pixelelectrode to the area of the second pixel electrode is 4:1.
 9. The pixelstructure as claimed in claim 8, wherein a voltage ratio of the mainpixel electrode to the sub-pixel electrode is 2.85:2.2, and a voltageratio of the sub-pixel electrode to the second pixel electrode is2.85:2.3.
 10. The pixel structure as claimed in claim 1, wherein theconductive line comprises: a main portion disposed overlapping the firstpixel electrode; and a branch portion extending from the main portion,disposed overlapping the second pixel electrode.
 11. A pixel structure,comprising: an active device; a main pixel electrode electricallyconnected to the active device, wherein the main pixel electrodecomprises a plurality of first branch patterns, wherein a slit widthbetween adjacent first branch patterns is ST1; and at least onesub-pixel electrode electrically connected to the active device, whereinthe at least one sub-pixel electrode comprises a plurality of secondbranch patterns, wherein a slit width between adjacent second branchpatterns is ST2, wherein ST1<ST2.
 12. The pixel structure as claimed inclaim 11, wherein a ratio of an area of the main pixel electrode to anarea of the at least one sub-pixel electrode is 4:1.
 13. The pixelstructure as claimed in claim 11, wherein a voltage ratio of the mainpixel electrode to the at least one sub-pixel electrode is 2.85:2.3. 14.The pixel structure as claimed in claim 11, wherein the at least onesub-pixel electrode is located on two sides of the main pixel electrode.15. A pixel array, comprising: a plurality of first pixel structures,each of the first pixel structures comprising: a first active device;and a first pixel electrode electrically connected to the first activedevice; and a plurality of second pixel structures, each of the secondpixel structures comprising: a second active device; a second pixelelectrode electrically connected to the second active device; a thirdpixel electrode electrically insulated from the second pixel electrode;and a conductive line located below the second pixel electrode and thethird pixel electrode, wherein the second active device is electricallyconnected to the second pixel electrode through the conductive line, andthe conductive line is coupled to the third pixel electrode to form acoupling capacitance.
 16. A display panel, comprising: a first substratecomprising a pixel array as claimed in claim 15 disposed thereon; asecond substrate located opposite to the first substrate; a color filterlayer located on the first substrate or the second substrate; and adisplay medium located between the first substrate and the secondsubstrate.
 17. The display panel as claimed in claim 16, wherein: thecolor filter layer comprises a plurality of red filter patterns, aplurality of blue filter patterns, and a plurality of green filterpatterns, the red filter patterns and the green filter patterns aredisposed corresponding to the first pixel structures of the pixel arrayon the first substrate, and the blue filter patterns are disposedcorresponding to the second pixel structures of the pixel array on thefirst substrate.